Don't fire Alt-Search binding when Alt-Search is being used for accessing a modifer key.

ash/accelerators/accelerator_controller.cc

Index: ash/accelerators/accelerator_controller.cc
diff --git a/ash/accelerators/accelerator_controller.cc b/ash/accelerators/accelerator_controller.cc
index fbe39d16a2bef57acd9b520adb457ee134d8c662..4c8bc96765d6d804f50e476d1eabcbcd8e1aa0fd 100644
--- a/ash/accelerators/accelerator_controller.cc
+++ b/ash/accelerators/accelerator_controller.cc
@@ -583,6 +583,14 @@ bool AcceleratorController::PerformAction(int action,
       }
       return false;
     case TOGGLE_CAPS_LOCK:
+      if (key_code == ui::VKEY_LWIN) {
+        // If something else was pressed between the Search key (LWIN)
+        // being pressed and released, then ignore the release of the
+        // Search key.

[mazda, 2012/12/17 21:41:54]

nit: Please add a comment on http://crbug.com/166495.

[danakj, 2012/12/17 21:48:02]

Done.

+        if (previous_event_type == ui::ET_KEY_RELEASED ||
+            previous_key_code != ui::VKEY_LWIN)
+          return false;
+      }
       shell->caps_lock_delegate()->ToggleCapsLock();
       return true;
     case BRIGHTNESS_DOWN: